JP5259777B2 - Electronic device and power supply control method - Google Patents

Description

  The present invention relates to an electronic device having a speaker and a power supply control method.

  2. Description of the Related Art Conventionally, there has been known an apparatus that can independently perform reproduction and listening operations of signals using headphones in a portable computer in which a disc player is incorporated (Patent Document 1). In the portable computer described in Patent Document 1, when a headphone plug is inserted into the headphone jack, power is supplied to the disk player unit, the headphone playback circuit, and the operation switch unit, so that the playback listening operation by the headphone is performed. This can be performed regardless of the switching operation of the power switch for supplying power to the computer circuit section.

Japanese Patent Laid-Open No. 10-340517

  As described above, according to the related art, it is possible to perform the reproduction / listening operation using the headphones regardless of the switching operation of the power switch. However, since it is necessary to operate according to the operation of the playback operation switch, music selection operation switch, fast-forward operation switch, and stop operation switch provided in the operation switch section, the portable computer is started as a disc player. It was necessary to let them.

  In the prior art, the portable computer is merely operated as a disc player, and an audio signal from an external music playback device (such as a portable audio player) cannot be input and output from the headphones.

  The present invention has been made in consideration of the above-described circumstances, and enables sound output based on a sound signal from an external music playback device even in a non-operating state and realizes power saving at the time of sound output. An object of the present invention is to provide an electronic device and a power supply control method that can be used.

According to the embodiment, the electronic device has a terminal for inputting an audio signal from an external device , an amplifier for amplifying the audio signal input to the terminal , and power is supplied to the amplifier in a non-operating state. even if not, and control means for controlling to power to the amplifier if the plug to the terminal is inserted.

  According to the present invention, it is possible to output sound based on a sound signal from an external music playback device even in a non-operating state, and to realize power saving at the time of sound output.

1 is an external view illustrating a configuration of an electronic device according to an embodiment. 1 is a block diagram showing a system configuration of a personal computer 10 in the present embodiment. The figure which shows the power supply supplied in each state (system state) of the personal computer in this embodiment. The figure which shows the transition of the state (system state) of the personal computer 10 in this embodiment. The flowchart which shows operation | movement of the personal computer 10 in this embodiment. The flowchart which shows operation | movement of the personal computer 10 in this embodiment. The figure which shows the module supplied with a power supply at the time of power-on in this embodiment. The figure which shows the module supplied with power at the time of the standby mode without plug insertion in this embodiment. The figure which shows the module supplied with power at the time of the standby mode with plug insertion in this embodiment. The figure which shows the module supplied with power at the time of the power-off without plug insertion in this embodiment. The figure which shows the module supplied with a power supply at the time of power-off with plug insertion in this embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an external view illustrating a configuration of an electronic device according to the present embodiment. This electronic device is realized as, for example, a notebook portable personal computer 10. When the personal computer 10 according to the present embodiment is in a non-operating state, an analog audio signal output from an external device with a line-out (for example, a portable audio player 25) is input, and the speaker 18 mounted on the housing. Has an audio output function (sleep & music function).

  When the output from the audio player 25 is directly connected to a speaker, the output of the audio player 25 is smaller than the capability of the speaker, so that a sound with a sufficient volume cannot be output. The audio output function provided in the personal computer 10 according to the present embodiment supplies power to the amplifier for amplifying the audio signal built in, even when the personal computer 10 is in a non-operating state. An audio signal can be amplified and output from a speaker.

  The non-operating state of the personal computer 10 includes, for example, states called standby / sleep / suspend and hibernation (hibernation state) in addition to the power-off state. That is, the non-operating state is a state where the processor (CPU 30) is not operating.

  FIG. 1 is a perspective view of the personal computer 10 with the display unit opened. The personal computer 10 includes a computer main body 11 and a display unit 12. The display unit 12 incorporates a display device composed of an LCD (Liquid Crystal Display) 17, and the display screen of the LCD 17 is positioned substantially at the center of the display unit 12.

  The display unit 12 is attached to the computer main body 11 so as to be rotatable between an open position and a closed position. The computer main body 11 has a thin box-shaped housing to which a battery can be detachably mounted.

  On the top surface of the computer main body 11, a keyboard 13, a power button switch 14 for power on / off, a general-purpose hardware button 15, a touch pad 16, a speaker 18, and the like are arranged.

  On the side of the computer main body 11, a line-in terminal 19 (jack) for inputting an analog audio signal output from the audio player 25 is used to adjust the volume when the audio output function is valid when not operating. A volume knob 20 is provided. A cable 26 connected to the line-out terminal of the audio player 25 can be connected to the line-in terminal 19.

  Next, the system configuration of the personal computer 10 in the present embodiment will be described with reference to FIG.

  As shown in FIG. 2, the personal computer 10 includes a CPU 30, an MCH 31 (north bridge), a main memory 32, a display controller 35, an ICH 40 (south bridge), a hard disk drive (HDD) 41, a BIOS-ROM 42, an embedded controller / keyboard controller. An IC (EC / KBC) 45, a power supply circuit 46, and the like are provided.

  The CPU 30 is a processor provided for controlling the operation of the personal computer 10, and includes an operating system (OS), drivers for controlling various hardware, various application programs, and the like loaded from the HDD 41 to the main memory 32. Run. Further, the CPU 30 also executes a system BIOS (Basic Input Output System) stored in the BIOS-ROM 42. The system BIOS is a program for hardware control.

  The MCH 31 is a bridge device that connects the local bus of the CPU 30 and the ICH 40. The MCH 31 also includes a memory controller that controls access to the main memory 32.

  The display controller 35 controls the LCD 17 that is used as a display monitor of the personal computer 10. The display controller 35 executes display processing (graphics calculation processing) for drawing a frame group in the video memory (VRAM) based on a drawing request transmitted from the CPU 30 via the MCH 31.

  The ICH 40 includes an IDE (Integrated Drive Electronics) controller and a Serial ATA controller for controlling the HDD 41 and an optical disk drive (not shown).

  The embedded controller / keyboard controller IC (EC / KBC) 45 integrates an embedded controller for power management and a keyboard controller for controlling the keyboard (KB) 13, the touch pad 15, and the general-purpose hardware buttons 18. And a one-chip microcomputer.

  The EC / KBC 45 has a function of controlling the power supply circuit 46 in accordance with the operation of the power button switch 14 by the user to power on / off the personal computer 10. The power-on / power-off control of the personal computer 10 is executed by the joint operation of the EC / KBC 45 and the power supply circuit 46. The EC / KBC 45 controls a sound output function used when the personal computer 10 is not operating.

  The power supply circuit 46 receives power supply from a battery 47 attached to the computer main body 11 or an external power supply connected via an AC adapter 48 to generate and supply operating power to each component. The power supply circuit 46 is provided with a power supply microcomputer. The power supply microcomputer monitors the power supply (charge / discharge) to each component and the battery and the charge state of the battery.

  The power supply circuit 46 switches the power supply to each module under the control of the EC / KBC 45 according to the system state of the personal computer 10. The power supply circuit 46 can turn on / off the power supply for each of the S power supply, the B power supply, the A power supply, and the P power supply under the control of the EC / KBC 45 according to the system state of the personal computer 10.

  The S power source is a power source that is always supplied even when the system is powered off, and is supplied to the EC / KBC 45.

  The B power source is a power source supplied to back up data recorded in the main memory 32 in the standby state.

  The A power source is a power source for enabling the voice output function when the personal computer 10 is in a non-operating state, and is a power source supplied to the analog switch 53 and the speaker amplifier 54 that process the analog voice signal.

  The P power source is a power source that is supplied when the personal computer 10 is in a power-on state.

FIG. 3 is a diagram showing power supplied in each state (system state) of the personal computer 10.
As shown in FIG. 3, when the personal computer 10 is in a power-on state (operating state), the power supply circuit 46 turns on all the supplies of S power, B power, P power, and A power.

  Further, when the personal computer 10 is in a standby state (or a sleep / suspend state), the S power supply and the B power supply are turned on. However, since the personal computer 10 of the present embodiment uses the audio output function in the standby state, when the plug for connecting the cable 26 (portable audio player 25) is inserted into the line-in terminal 19, The A power supply is turned on to supply power to the analog switch 53 and the speaker amplifier 54 that are operated by the audio output function.

  When the personal computer 10 is in a power-off state (including hibernation (hibernation state) that does not require backup to the main memory 32), only the S power supply is turned on. However, since the personal computer 10 of this embodiment uses the audio output function in the power-off state, when a plug for connecting the cable 26 (portable audio player 25) is inserted into the line-in terminal 19, Further, the power supply A is turned on to supply power to the analog switch 53 and the speaker amplifier 54 that are operated by the sound output function.

  Since the EC power supply is supplied to the EC / KBC 45, the power supply is turned on in any system state, and the audio output function can be controlled when not operating.

  The sound controller 50 (audio codec) converts the digital audio data input through the ICH 40 into an analog audio signal, adjusts the volume by controlling the OS, device driver, audio reproduction program, etc., and outputs the analog audio signal to the analog switch 53. Similarly, when the personal computer 10 is in operation, the sound controller 50 similarly adjusts the volume of the analog audio signal input from the audio player 25 input via the line-in terminal 19 to the analog switch 53. Output.

  The analog switch 53 switches to either the sound controller 50 side or the line-in terminal 19 side according to the select signal S2 from the EC / KBC 45. The analog switch 53 is switched to the sound controller 50 side when the personal computer 10 is operating under the control of the EC / KBC 45, and the line-in terminal 19 that bypasses the sound controller 50 when the sound output function is valid when the personal computer 10 is not operating. Switched to the side.

  The speaker amplifier 54 amplifies an analog audio signal input via the analog switch 53 and outputs sound corresponding to the audio signal from the speaker 18. The speaker amplifier 54 adjusts the volume of the audio signal according to the operation on the volume knob 20 when the audio output function is valid.

  The line-in terminal 19 incorporates a switch 52. The switch 52 is switched on / off by inserting a plug for connecting the cable 26 to the line-in terminal 19 and outputs a status signal S1 corresponding to the on / off state to the EC / KBC 45.

Next, the operation of the personal computer 10 in this embodiment will be described.
When the personal computer 10 according to the present embodiment is in a non-operating state such as a power-off or standby mode, when a plug for connecting the cable 26 is inserted into the line-in terminal 19, power supply to the speaker amplifier 54 ( A power supply) is turned on, and the analog switch 53 that bypasses the sound controller 50 is switched. As a result, sound (music) based on the sound signal output from the portable audio player 25 is output from the speaker 18 built in the personal computer 10 without starting the personal computer 10.

  FIG. 4 is a diagram showing transition of the state (system state) of the personal computer 10 in the present embodiment. 5 and 6 are flowcharts showing the operation of the personal computer 10.

  When the personal computer 10 is instructed to turn on the power by operating the power button switch 14 (step A3, Yes), it supplies power to each module from the power circuit 46 under the control of the EC / KBC 45 (step A4). In the power-on state, the power supply circuit 46 turns on all the power supplies of S power, B power, P power, and A power (state M1 shown in FIG. 4).

  FIG. 7 shows a module supplied with power when the power is turned on. As shown in FIG. 7, power is supplied to the CPU 30, MCH 31, ICH 40, main memory 32, HDD 41, sound controller 50, analog switch 53, speaker amplifier 54, and the like. When the power is turned on, the EC / KBC 45 switches the analog switch 53 to the sound controller 50 side by the select signal S2.

  As for audio processing, the OS, device driver, software program, and the like operate to control each module. The sound controller 50 converts digital audio data into an analog audio signal under the control of a program and outputs the analog audio signal to the analog switch 53. The speaker amplifier 54 amplifies an analog audio signal input via the analog switch 53 and outputs sound from the speaker 18.

  The sound controller 50 also controls the volume of the analog audio signal input from the line-in terminal 19 and outputs the analog audio signal to the analog switch 53. Similarly, the speaker amplifier 54 amplifies an analog audio signal input via the analog switch 53 and outputs sound from the speaker 18.

  When the user instructs to shift to the standby mode (step A1, Yes), the EC / KBC 45 turns off the supply of P power to the power circuit 46. That is, when the power supply circuit 46 shifts to the standby mode (m12 in FIG. 4), the power supply circuit 46 turns on only the B power supply and the S power supply (state M2 shown in FIG. 4). FIG. 8 shows a module to which power is supplied in the standby mode without plug insertion. As shown in FIG. 8, the power supply to many modules including the CPU 30 is turned off, and a standby mode is achieved in which power consumption is reduced. In the standby mode, since the CPU 30 does not operate, the program cannot operate.

0046
At this time, when a plug is inserted in the line-in terminal 19, the switch 52 built in the line-in terminal 19 is turned on, and the status signal S1 connected to the EC / KBC 45 is in the low state. The EC / KBC 45 detects that a plug is inserted into the line-in terminal 19 based on the status signal S1. When the EC / KBC 45 detects the insertion of the plug (step A5, Yes) (m23 in FIG. 4), the speaker amplifier uses the mute signal S3 to switch to the speaker amplifier power-on mode for enabling the audio output function. 54 is muted (step A6). That is, noise is generated when the power to the speaker amplifier 54 is turned on or when the analog switch 53 is switched, so that no sound is output from the speaker 18 by the speaker amplifier 54.

  After the speaker amplifier 54 is muted, the EC / KBC 45 turns on the supply of A power to the power circuit 46 (step A7) and shifts to the speaker amplifier power on mode (state M3 in FIG. 4). FIG. 9 shows a module supplied with power in the standby mode with plug insertion. As shown in FIG. 9, the power supply to many modules including the CPU 30 is turned off, and the power supply A is supplied only to the speaker amplifier 54 and the analog switch 53 related to the audio output function while remaining in the standby mode with reduced power consumption. Is supplied.

  The sound controller 50 does not operate in the standby mode controlled by the program. For this reason, the EC / KBC 45 controls the analog switch 53 with the select signal S2 and switches the path so that the analog audio signal input from the line-in terminal 19 is transmitted to the speaker amplifier 54 bypassing the sound controller 50 ( Step A8).

  After the switching of the analog switch 53 is completed, the EC / KBC 45 cancels the mute state of the speaker amplifier 54 by the mute signal S3 (step A9).

  In the speaker amplifier power-on mode, for example, when music is played on the portable audio player 25 connected to the line-in terminal 19, an analog audio signal of this music is input to the speaker amplifier 54 through the line-in terminal 19 and the analog switch 53. The The speaker amplifier 54 is supplied with the A power supply by the power supply circuit 46, and therefore can amplify an analog audio signal and output music from the speaker 18. At this time, the personal computer 10 is in a standby state, and power is not supplied to modules not related to the audio output function.

  On the other hand, when the user gives an instruction to turn off the power when the power is turned on (step A1, Yes), the EC / KBC 45 turns off the power supply of the P power and the B power to the power circuit 46. That is, when the power supply circuit 46 is shifted to the power-off state (m12 in FIG. 4), the power supply circuit 46 is turned on for only the S power supply (state M2 shown in FIG. 4). FIG. 10 shows a module supplied with power when the power is turned off without plug insertion. As shown in FIG. 10, since the backup of the main memory 32 is not required, the B power is not supplied and the power consumption is reduced most.

  Even when the power is off, if a plug is inserted into the line-in terminal 19 (step A5, Yes), the speaker amplifier power-on mode is entered in the same manner as in the standby mode described above, and the portable audio player The sound output from 25 can be output from the speaker 18 (steps A6 to A9). FIG. 11 shows a module supplied with power when the power is turned off with a plug inserted. As shown in FIG. 11, in addition to the S power supply, the A power supply is supplied only to the speaker amplifier 54 and the analog switch 53 related to the audio output function, so that the power consumption can be reduced.

  When the plug is removed from the line-in terminal 19 in the speaker amplifier power-on mode, the EC / KBC 45 detects the removal of the plug by the status signal S1 from the switch 52 (step A10, Yes) (m32 in FIG. 4). ). The EC / KBC 45 puts the speaker amplifier 54 in the mute state by the mute signal S3 before shifting to the power-off state or the standby state before the plug is inserted into the line-in terminal 19 (step A11).

  After the speaker amplifier 54 is muted, the EC / KBC 45 controls the analog switch 53 with the select signal S2 to switch to the sound controller 50 side, and the analog audio signal input from the line-in terminal 19 is converted to the sound controller 50. The route is switched so as to be transmitted to the speaker amplifier 54 via (step A12).

  The EC / KBC 45 supplies power to the power circuit 46 in accordance with power off or standby mode (step A13). That is, when the power is off, only the S power supply is turned on (FIG. 10), and when in the standby mode, the B power supply and the S power supply are turned on (FIG. 8). That is, the A power supply to the analog switch 53 and the speaker amplifier 54 is turned off.

  After completing the switching of the power supply, the EC / KBC 45 cancels the mute state of the speaker amplifier 54 by the mute signal S3 (step A14).

  Further, when the power button switch 14 is pressed in the speaker amplifier power-on mode and the power-on is instructed by the user (step A15, Yes), the EC / KBC 45 puts the speaker amplifier 54 in the mute state by the mute signal S3. (Step A16).

  After the speaker amplifier 54 is muted, the EC / KBC 45 makes all of the S power, B power, P power, and A power to the power circuit 46 in order to shift to the power-on state (m31 in FIG. 4). Supply is turned on (state M1 shown in FIG. 4).

  Further, the EC / KBC 45 controls the analog switch 53 by the select signal S2 so that the analog audio signal input from the line-in terminal 19 is transmitted to the speaker amplifier 54 via the sound controller 50 to the sound controller 50 side. The route is switched (step A18).

  After the switching of the analog switch 53 is completed, the EC / KBC 45 cancels the mute state of the speaker amplifier 54 by the mute signal S3 (step A19).

  Thus, in the personal computer 10 according to the present embodiment, when the plug for connecting the portable audio player 25 to the line-in terminal 19 is inserted in a non-operating state such as power-off or standby mode, the speaker amplifier 54 is inserted. The personal computer 10 is not restarted by turning on the power supply (A power supply) to the audio signal and by causing the sound controller 50 to bypass the analog audio signal input from the line-in terminal 19 and input it to the speaker amplifier 54. In addition, sound based on the sound signal output from the portable audio player 25 can be output from the speaker 18.

  In the above description, the line-in terminal 19 is described as an audio signal input, but it may also be used as a microphone connection. In this case, power for a microphone is supplied to the line-in terminal 19 via the sound controller 50. For the sound controller 50, the power supply for the microphone is not supplied to the line-in terminal 19 because the supply of the P power supply is turned off in the power-off or standby mode.

  In the above description, when plug insertion is detected by the switch 52, the A power supply (power supply to the speaker amplifier 54 and the analog switch 53) by the power supply circuit 46 is turned on. Thus, the supply of the A power supply may be switched on / off. For example, as shown in FIG. 2, a switch 60 is provided for manually instructing on / off of power supply of the A power source. When the EC / KBC 45 detects that the switch 60 is turned on by a user's manual operation when the personal computer 10 is in a non-operating state, the EC / KBC 45 sets the power supply circuit 46 to turn on the A power supply.

  Further, instead of the switch 52 built in the line-in terminal 19, an independent switch may be provided so that on / off can be switched by a manual operation of the user. A status signal S1 corresponding to ON / OFF of the switch is input to the EC / KBC 45. When the user uses the portable audio player 25 connected to the personal computer 10, the user can enable the audio output function by turning this switch on.

  Further, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine a component suitably in different embodiment.

  DESCRIPTION OF SYMBOLS 10 ... Personal computer, 11 ... Computer main body, 17 ... LCD, 18 ... Speaker, 19 ... Line-in terminal, 30 ... CPU, 32 ... Main memory, 42 ... BIOS-ROM, 45 ... EC / KBC, 46 ... Power supply circuit, 52 ... Switch, 53 ... Analog switch, 54 ... Speaker amplifier.

Claims (9)

A terminal for inputting audio signals from an external device;
An amplifier for amplifying the audio signal input to the terminal;
An electronic device comprising control means for controlling power supply to the amplifier if a plug is inserted into the terminal even when power is not supplied to the amplifier in a non-operating state machine. A terminal for inputting an audio signal from an external device to the electronic device;
An amplifier for amplifying the audio signal input to the terminal;
A second power supply system that supplies power to the amplifier, which is different from the first power supply system that supplies power to each component of the electronic device;
An electronic device comprising: control means for controlling power supply from the second power supply system to the amplifier if a plug is inserted in the terminal. A switching unit that further switches to a first path that connects the terminal and the amplifier and a second path that connects the terminal and the amplifier via a controller that operates when the electronic device is in operation. And
Wherein, when said electric power supplied to the amplifier, the electronic apparatus according to the switching means to claim 1 or 2 switch to the first path side. The control means instructs the amplifier to mute an audio signal output from the amplifier before supplying power to the amplifier, and releases the mute after starting to supply power. Or the electronic device of 2. A sound controller that operates when the electronic device is in operation;
The electronic device according to claim 1, wherein the amplifier amplifies the audio signal input to the terminal and input to the amplifier without passing through the sound controller in the non-operating state. A sound controller powered by the first power supply system;
The electronic device according to claim 2, wherein the amplifier amplifies the audio signal input to the terminal and input to the amplifier without passing through the sound controller if a plug is inserted into the terminal. A method of controlling power supply to an amplifier provided in an electronic device,
When the electronic device is in a non-operating state,
The control means detects whether or not a plug is inserted into a terminal for inputting an audio signal from an external device provided in the electronic device,
A power supply control method for controlling power supply to the amplifier by a power supply system that is different from a power supply system that supplies power to each component of the electronic device when a plug is inserted. The control means instructs the amplifier to mute an audio signal output from the amplifier before supplying power to the amplifier, and cancels the mute after starting to supply power. The power supply control method described in 1. A method of controlling power supply to each component of an electronic device,
The processor detects an instruction to change the system state to the electronic device, and if it is a power-off or a transition instruction to the standby mode, a power supply that supplies power to each component that needs power supply in the mode. While turning on,
The processor detects whether or not a plug is inserted into a terminal for inputting an audio signal from an external device included in the electronic device. If the plug is inserted, the processor outputs the audio signal output from the terminal. Turn on the power supplied to the amplifier to be amplified,
The processor is a power supply control method for turning off the power when the power supplied to the amplifier is on and the plug is not inserted.

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